Instruction Manual
Page 5
.... The specifications must be tightened to the hose barbs, b 14. do not use original STIHL replacement parts. Always install new hoses - Do not smoke or bring any fire, flame or...parts for wear or damage before carrying out repairs or mounting the machine to overheating. 4 MS 231, MS 231 C, MS 251, MS 251 C Do not re-use fuel hoses after working on the ignition system. All work on...can be overstretched during removal. Preparations for servicing Remove the chain sprocket cover, saw chain and guide bar before re-installing - Install new fuel hoses either dry or with a...
.... The specifications must be tightened to the hose barbs, b 14. do not use original STIHL replacement parts. Always install new hoses - Do not smoke or bring any fire, flame or...parts for wear or damage before carrying out repairs or mounting the machine to overheating. 4 MS 231, MS 231 C, MS 251, MS 251 C Do not re-use fuel hoses after working on the ignition system. All work on...can be overstretched during removal. Preparations for servicing Remove the chain sprocket cover, saw chain and guide bar before re-installing - Install new fuel hoses either dry or with a...
Instruction Manual
Page 9
... under full load Cause Clutch shoes badly worn Clutch drum badly worn Remedy Install new clutch Install new clutch drum Saw chain rotates at idle speed Engine idle speed too high Clutch springs stretched Clutch springs broken Readjust idle speed screw LA Replace the clutch springs or ... Clutch shoe retainer broken Clutch shoes and carrier worn Replace all clutch springs Fit new needle cage Install new retainer or clutch Install new clutch 8 MS 231, MS 231 C, MS 251, MS 251 C 3.
... under full load Cause Clutch shoes badly worn Clutch drum badly worn Remedy Install new clutch Install new clutch drum Saw chain rotates at idle speed Engine idle speed too high Clutch springs stretched Clutch springs broken Readjust idle speed screw LA Replace the clutch springs or ... Clutch shoe retainer broken Clutch shoes and carrier worn Replace all clutch springs Fit new needle cage Install new retainer or clutch Install new clutch 8 MS 231, MS 231 C, MS 251, MS 251 C 3.
Instruction Manual
Page 10
... drum badly worn Brake band blocked Install new clutch Install new clutch drum Check freedom of movement and operation of brake band Saw chain rotates at idle speed Engine idle speed too high Clutch springs stretched Clutch springs broken Readjust idle speed screw LA Replace the ...clutch springs or install new clutch Replace the clutch springs Saw chain does not stop immediately when brake is activated Brake spring stretched or broken Fit new brake spring Brake band stretched or worn Clutch drum worn Fit new brake band Install new clutch drum MS 231, MS 231 C, MS 251, MS 251 C 9
... drum badly worn Brake band blocked Install new clutch Install new clutch drum Check freedom of movement and operation of brake band Saw chain rotates at idle speed Engine idle speed too high Clutch springs stretched Clutch springs broken Readjust idle speed screw LA Replace the ...clutch springs or install new clutch Replace the clutch springs Saw chain does not stop immediately when brake is activated Brake spring stretched or broken Fit new brake spring Brake band stretched or worn Clutch drum worn Fit new brake band Install new clutch drum MS 231, MS 231 C, MS 251, MS 251 C 9
Instruction Manual
Page 17
...closed Tank vent faulty Clean the carburetor Reset low speed screw (L) correctly Reset idle speed screw (LA) correctly Replace tank vent Saw chain rotates at idle speed Leak on fuel hose from tank to carburetor Seal connections or install new fuel hose Engine idle speed too...) Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Clutch spring hooks broken Replace the clutch springs 16 MS 231, MS 231 C, MS 251, MS 251 C Condition Cause Remedy Engine will not idle, idle speed too Throttle shutter opened too wide by Reset idle speed screw (LA...
...closed Tank vent faulty Clean the carburetor Reset low speed screw (L) correctly Reset idle speed screw (LA) correctly Replace tank vent Saw chain rotates at idle speed Leak on fuel hose from tank to carburetor Seal connections or install new fuel hose Engine idle speed too...) Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Clutch spring hooks broken Replace the clutch springs 16 MS 231, MS 231 C, MS 251, MS 251 C Condition Cause Remedy Engine will not idle, idle speed too Throttle shutter opened too wide by Reset idle speed screw (LA...
Instruction Manual
Page 21
... brake and the saw . The braking time is in terms of the machine. 20 MS 231, MS 231 C, MS 251, MS 251 C If the chain brake does not operate properly, refer to an abrupt stop . : Take out the screws (1). : Remove the cover (2). 219RA049 TG Machines with chain oil, chips, fine...than a second) is measured in order if deceleration of the lockout lever on the rear handle - the chain must come to a complete standstill. the chain must come areas on the chain saw chain coming to an abrupt stop . 2310RA007 TG 1 : Remove the screw (1) from the brake lever (2). 2310RA008...
... brake and the saw . The braking time is in terms of the machine. 20 MS 231, MS 231 C, MS 251, MS 251 C If the chain brake does not operate properly, refer to an abrupt stop . : Take out the screws (1). : Remove the cover (2). 219RA049 TG Machines with chain oil, chips, fine...than a second) is measured in order if deceleration of the lockout lever on the rear handle - the chain must come to a complete standstill. the chain must come areas on the chain saw chain coming to an abrupt stop . 2310RA007 TG 1 : Remove the screw (1) from the brake lever (2). 2310RA008...
Instruction Manual
Page 97
... setting of lubrication and overheating. 96 MS 231, MS 231 C, MS 251, MS 251 C Erratic idling behavior, poor acceleration (although standard setting is idling - Turn the adjusting screws only very slightly. It is a risk of engine damage as stop, but not more than stop , then turn it back 1 full turn . Saw chain runs while engine is correct) Idle...
... setting of lubrication and overheating. 96 MS 231, MS 231 C, MS 251, MS 251 C Erratic idling behavior, poor acceleration (although standard setting is idling - Turn the adjusting screws only very slightly. It is a risk of engine damage as stop, but not more than stop , then turn it back 1 full turn . Saw chain runs while engine is correct) Idle...